Free Old Auto Tune

Auto-Tune is a proprietary audio processor created by Antares Audio Technologies. Auto-Tune uses a phase vocoder to correct pitch in vocal and instrumental performances. It is used to disguise off-key inaccuracies and mistakes to allow for less takes in a studio. Auto-Tune Pro is the most complete and advanced edition of Auto Tune for Windows PC.It includes both Auto Mode, for real-time pitch correction and effects, and Graph Mode, for detailed pitch and time editing.For twenty years, the tool has been the professional standard for pitch correction, and the tool of choice for the most iconic vocal effect in popular music.

PitchWorx DX

This freeware pitch shifter is one of the rare free pitch shift effect available: it allows you to change the pitch of the sound without changing the speed.
You have to use a DX-VST wrapper such as the VB-FFX4 wrapper in order to make PitchWorx work with Wavosaur.
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Old

4BandShifter VST

This pitch shifter VST lets you split the incoming signal in 4 spectral bands and then apply a pitch shift for each band..
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Spectral monkeyage VST

This FFT pitch shifter VST is a good old plugin. Change the pitch without altering the speed (up to -24 +24 semitones)
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Free Old Auto Tuners

Gsnap autotune VST

Free autotune VST plugins are also rare, GSnap is effective and does a good job.
For the moment you'll have to use the fixed scale correction. We'll add MIDI input for VST plugins later.
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AAS Autotune VST

This GUI-Less autotune VST was in the early free version of Aodix, developped by Arguru.
It can be pushed hard to create a - famous - effect.
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Auto Tune App

Tune

Best Auto Tune Software Free

Related forum topics:
Sound effects on voice
DirectX effects with Wavosaur